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Patran sandwich composite model

Patran sandwich composite model

Patran sandwich composite model

(OP)
Hello everybody I could really use some help in modelling sandwich coupons (a honeycomb core between two composite faacesheets) in Patran/Nastran. I am new at the software so excuse me if my questions seem too elementary.

I have identified three methods in which I can model my sandwich.

1) I can model each composite ply and the honeycomb core as a 3-d. My question is when I create each ply as a group how do I specify the bond strength and contact type with the other lamina? I will be looking at interlaminar failure so this is important to me.

2) The second method is modeling the facesheets as a 2-d with the core being 3-d. I will draw a 2-d surface then using PCOMP I will assign the ply properties, however, when I want to "bond" my facesheet to the core do I have to offset by the thickness of my laminate or can I just place on the face of my 3-d core

3) My third method is to just model the whole thing using PCOMP.

Also if someone can tell me the advantages and disadvantages of modeling using one method over the other I would be very appreciative.

Thank you,

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